android开发权限询问

作者: 你的益达233 | 来源:发表于2018-01-11 20:19 被阅读63次

    现在基于信息安全问题,特别是版本是23以上权限越严格。
    特别是拍照,读,写权限
    一般权限允许过,下次就不用询问了的,所以很多应用都喜欢在首页或者启动页直接询问,不允许的就用不了
    1、下面给出封装好的类,至于什么时候调看项目需要

    public class EasyPermissions {
    
    private static final String TAG = "EasyPermissions";
    
    public interface PermissionCallbacks extends
            ActivityCompat.OnRequestPermissionsResultCallback {
    
        void onPermissionsGranted(List<String> perms);
    
        void onPermissionsDenied(List<String> perms);
    
    }
    
    /**
     * Check if the calling context has a set of permissions.
     *
     * @param context the calling context.
     * @param perms   one ore more permissions, such as {@code android.Manifest.permission.CAMERA}.
     * @return true if all permissions are already granted, false if at least one permission
     * is not yet granted.
     */
    public static boolean hasPermissions(Context context, String... perms) {
        for (String perm : perms) {
            boolean hasPerm = (ContextCompat.checkSelfPermission(context, perm) == PackageManager.PERMISSION_GRANTED);
            if (!hasPerm) {
                return false;
            }
        }
    
        return true;
    }
    
    /**
     * Request a set of permissions, showing rationale if the system requests it.
     *
     * @param object      Activity or Fragment requesting permissions. Should implement
     *                    {@link ActivityCompat.OnRequestPermissionsResultCallback}
     *                    or
     *                    {@link android.support.v13.app.FragmentCompat.OnRequestPermissionsResultCallback}
     * @param rationale   a message explaining why the application needs this set of permissions, will
     *                    be displayed if the user rejects the request the first time.
     * @param requestCode request code to track this request, must be < 256.
     * @param perms       a set of permissions to be requested.
     */
    public static void requestPermissions(final Object object, String rationale,
            final int requestCode, final String... perms) {
        requestPermissions(object, rationale,
                android.R.string.ok,
                android.R.string.cancel,
                requestCode, perms);
    }
    
    /**
     * Request a set of permissions, showing rationale if the system requests it.
     *
     * @param object         Activity or Fragment requesting permissions. Should implement
     *                       {@link ActivityCompat.OnRequestPermissionsResultCallback}
     *                       or
     *                       {@link android.support.v13.app.FragmentCompat.OnRequestPermissionsResultCallback}
     * @param rationale      a message explaining why the application needs this set of permissions, will
     *                       be displayed if the user rejects the request the first time.
     * @param positiveButton custom text for positive button
     * @param negativeButton custom text for negative button
     * @param requestCode    request code to track this request, must be < 256.
     * @param perms          a set of permissions to be requested.
     */
    public static void requestPermissions(final Object object, String rationale,
            @StringRes int positiveButton,
            @StringRes int negativeButton,
            final int requestCode, final String... perms) {
    
        checkCallingObjectSuitability(object);
    
        boolean shouldShowRationale = false;
        for (String perm : perms) {
            shouldShowRationale = shouldShowRationale || shouldShowRequestPermissionRationale(object, perm);
        }
    
        if (shouldShowRationale) {
           //弹框询问
            AlertDialog dialog = new AlertDialog.Builder(getActivity(object))
                    .setMessage(rationale)
                    .setPositiveButton(positiveButton, new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            executePermissionsRequest(object, perms, requestCode);
                        }
                    })
                    .setNegativeButton(negativeButton, new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            // Do nothing, user does not want to request
                            PermissionCallbacks callbacks = (PermissionCallbacks) object;
                            if(callbacks != null) {
                                callbacks.onPermissionsDenied(new ArrayList<String>());
                            }
                        }
                    }).create();
            dialog.show();
        } else {
            executePermissionsRequest(object, perms, requestCode);
        }
    }
    
    /**
     * Handle the result of a permission request, should be called from the calling Activity's
     * {@link ActivityCompat.OnRequestPermissionsResultCallback#onRequestPermissionsResult(int, String[], int[])}
     * method.
     * <p/>
     * If any permissions were granted or denied, the Activity will receive the appropriate
     * callbacks through {@link PermissionCallbacks} and methods annotated with
     * {@link AfterPermissionGranted} will be run if appropriate.
     *
     * @param requestCode  requestCode argument to permission result callback.
     * @param permissions  permissions argument to permission result callback.
     * @param grantResults grantResults argument to permission result callback.
     * @param object       the calling Activity or Fragment.
     * @throws IllegalArgumentException if the calling Activity does not implement
     *                                  {@link PermissionCallbacks}.
     */
    public static void onRequestPermissionsResult(int requestCode, String[] permissions,
            int[] grantResults, Object object) {
    
        checkCallingObjectSuitability(object);
        PermissionCallbacks callbacks = (PermissionCallbacks) object;
    
        // Make a collection of granted and denied permissions from the request.
        ArrayList<String> granted = new ArrayList<>();
        ArrayList<String> denied = new ArrayList<>();
        for (int i = 0; i < permissions.length; i++) {
            String perm = permissions[i];
            if (grantResults[i] == PackageManager.PERMISSION_GRANTED) {
                granted.add(perm);
            } else {
                denied.add(perm);
            }
        }
    
        // Report granted permissions, if any.
        if (!granted.isEmpty()) {
            // Notify callbacks
            callbacks.onPermissionsGranted(granted);
        }
    
        // Report denied permissions, if any.
        if (!denied.isEmpty()) {
            callbacks.onPermissionsDenied(denied);
        }
    
        // If 100% successful, call annotated methods
        if (!granted.isEmpty() && denied.isEmpty()) {
            runAnnotatedMethods(object, requestCode);
        }
    }
    
    private static boolean shouldShowRequestPermissionRationale(Object object, String perm) {
        if (object instanceof Activity) {
            return ActivityCompat.shouldShowRequestPermissionRationale((Activity) object, perm);
        } else if (object instanceof Fragment) {
            return ((Fragment) object).shouldShowRequestPermissionRationale(perm);
        } else {
            return false;
        }
    }
    
    private static void executePermissionsRequest(Object object, String[] perms, int requestCode) {
        checkCallingObjectSuitability(object);
    
        if (object instanceof Activity) {
            ActivityCompat.requestPermissions((Activity) object, perms, requestCode);
        } else if (object instanceof Fragment) {
            ((Fragment) object).requestPermissions(perms, requestCode);
        }
    }
    
    private static Activity getActivity(Object object) {
        if (object instanceof Activity) {
            return ((Activity) object);
        } else if (object instanceof Fragment) {
            return ((Fragment) object).getActivity();
        } else {
            return null;
        }
    }
    
    private static void runAnnotatedMethods(Object object, int requestCode) {
        Class clazz = object.getClass();
        for (Method method : clazz.getDeclaredMethods()) {
            if (method.isAnnotationPresent(AfterPermissionGranted.class)) {
                // Check for annotated methods with matching request code.
                AfterPermissionGranted ann = method.getAnnotation(AfterPermissionGranted.class);
                if (ann.value() == requestCode) {
                    // Method must be void so that we can invoke it
                    if (method.getParameterTypes().length > 0) {
                        throw new RuntimeException("Cannot execute non-void method " + method.getName());
                    }
    
                    try {
                        // Make method accessible if private
                        if (!method.isAccessible()) {
                            method.setAccessible(true);
                        }
                        method.invoke(object);
                    } catch (IllegalAccessException e) {
                        ILogger.e(TAG, "runDefaultMethod:IllegalAccessException", e);
                    } catch (InvocationTargetException e) {
                        ILogger.e(TAG, "runDefaultMethod:InvocationTargetException", e);
                    }
                }
            }
        }
    }
    
    private static void checkCallingObjectSuitability(Object object) {
        // Make sure Object is an Activity or Fragment
        if (!((object instanceof Fragment) || (object instanceof Activity))) {
            throw new IllegalArgumentException("Caller must be an Activity or a Fragment.");
        }
    
        // Make sure Object implements callbacks
        if (!(object instanceof PermissionCallbacks)) {
            throw new IllegalArgumentException("Caller must implement PermissionCallbacks.");
        }
    }}
    

    注:这个类不是我写的,分享给大家
    2、调用示例(activity或fragment):(方法调用的时机随你)

    private void requestGalleryPermission() {
        //权限参数可以添加很多,不固定参数的
        if (EasyPermissions.hasPermissions(this, Manifest.permission.READ_EXTERNAL_STORAGE,Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
            getPhotos();//如果具有权限做的操作
        } else {
            // Ask for one permission
            EasyPermissions.requestPermissions(this, getString(R.string.permissions_tips_gallery),
                    GalleryFinal.PERMISSIONS_CODE_GALLERY, Manifest.permission.READ_EXTERNAL_STORAGE,Manifest.permission.WRITE_EXTERNAL_STORAGE);
        }
    }
    

    3、拒绝和允许做的操作(activity或fragment):

    @Override
    public void onPermissionsGranted(List<String> list) {
        //允许
        getPhotos();
    }
    
    @Override
    public void onPermissionsDenied(List<String> list) {
        //拒绝
        mTvEmptyView.setText(R.string.permissions_denied_tips);
        //mIvTakePhoto.setVisibility(View.GONE);
    }
    

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